Re: [pygame] optimization for my sprite rendering

[Pete Shinners <pete@shinners.org>]

solitare0@netscape.net wrote:
> Sorry for the verbose post (but it's late and I've been working on this
> for too long) and thanks for any help you can give me in advance.
i'd start by using the RenderUpdates sprite group. This can do exactly what 
you want (i think) by clearing only the changed parts of the screen. You'll 
need to change your code so the background is not a sprite, but handled 
separately.

the RenderUpdates class has a "clear()" method that takes a background. It 
will draw the background only underneath the sprites. The "draw()" method 
for RenderUpdates returns a list of rectangles representing all the areas 
onscreen that have changed. You can pass that list to 
pygame.display.update() for the fastest frame switch possible.

When you do change you background image you will just need to draw the 
entire thing, and call pygame.display.update() to draw and update the entire 
screen. After that you can continue on normally.